package com.ygnn.reggie.controller;


import com.ygnn.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.lang.reflect.Field;
import java.util.UUID;

@RestController
@Slf4j
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private  String basePath;

//    文件上传
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
//        得到原始文件后缀
        String originalFilename = file.getOriginalFilename();
        String suffix=originalFilename.substring(originalFilename.lastIndexOf("."));

//        使用UUID生成文件名
        String fileName = UUID.randomUUID().toString() + suffix;

//        创建一个目录对象
        File dir =new File(basePath);
        if (!dir.exists())
        {
//            不存在，创建一个
            dir.mkdirs();
        }

        try {
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return R.success(fileName);
    }


//    文件下载
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
//            输入流，通过输入流读取文件内容
            FileInputStream fileInputStream =new FileInputStream(new File(basePath+name));
//            输出流，通过输出流将文件写回浏览器，在浏览器展示图片
            ServletOutputStream outputStream = response.getOutputStream();

//            设置类型
            response.setContentType("image/jpeg");

            int len=0;
            byte[] bytes = new byte[1024];
            while((len=fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

//            关闭
            outputStream.close();
            fileInputStream.close();

        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

}












